@Jo**
Your 90 day reporting has NOTHING to do with you moving. It's due when it's due and moving doesn't affect that.
You (or your new landlord) need to GO and file a TM30 <- notification of foreigner in residence form within 24 hours of moving to a new residence.
I'd say go to the Promenada and see if you can file a TM30 on your own or if you need documentation from your new land lord to do it..